Accounting policies (Details Textual) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Accounting Policies [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	$ (175,095)	$ 161,733
Certificates of Deposit, at Carrying Value	5,000,000		5,000,000
Cash and Cash Equivalents [Member]
Accounting Policies [Line Items]
Certificates of Deposit, at Carrying Value	$ 5,100,000		$ 3,000,000

- Definition

A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References+ Details